Circuit/System Description
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Cadillac Escalade ESV, and 2018 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
The solenoid actuator controls fluid pressure by moving the clutch C4-5-6-7-8-9-10-R regulator valve that controls the fluid pressure to the C4-5-6-7-8-9-10-R clutch.